WB-EDM-G Baseboard
  • 21 Dec 2021
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WB-EDM-G Baseboard

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WB-EDM-G Baseboard is an PCBA that is compatible with TechNexion's EDM-G family of SoMs. It is a compact baseboard (85mm x 125mm) that includes support for the following external connectors and peripheral devices:

Feature Description
Displays HDMI + Dual Channel LVDS Output
USB Type C 1x USB 3.0 OTG
USB Type A 2x USB 3.0 Host + 1x USB 2.0 Host
Network 1x 10/100/1000 Ethernet RJ45 jack
Camera 2x MIPI-CSI camera connectors (70-pin Hirose)
Audio On-board stereo audio codec (WM8960), including 3.5mm TRRS headset/mic connector and 2x 8-ohm speaker outputs
I/O Expansion 1x 40-pin header (similar to Raspberry Pi)
Console 2x UART connectors (3.3V TTL/CMOS)
SD Card 1x microSD card slot
M.2 Connector 1x M.2 Key B connector with connected SIM card slot
Power Supply 12VDC via DC barrel jack connector

Board Pictures

Top View

Top view, with EDM-G-IMX8M-PLUS System-on-Module assembled


Side View

Side view, showing power entry, USB Type C, HDMI, USB Type A, Ethernet, and audio

Bottom View

Bottom view, show M.2 slot and microSD card slot

Boot Media Selection Switch

There are two main boot media selection settings: Boot from EMMC, and boot from microSD card. On the Wandboard EDM-G, this is controlled using the DIP switch SW1. If SW1 is OFF, then the board will boot from e.MMC. If SW1 is ON, the board will boot from the baseboard microSD card.

Note the default boot media is EMMC

Boot Mode Selection Button

There are two main boot modes: Normal boot, in which the SOC boots from either e.MMC or microSD card (as determined by the SW1 setting), and serial download mode. Serial download mode is useful when attempting to reprogram blank e.MMC, or to completely overwrite the e.MMC without a requirement to run a serial console.

To boot into serial download mode, press and hold BUTTON1 while while pressing RESET1 (reset pushbutton switch).

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